Novel superconductivity realized in restricted geometry
| Project/Area Number |
15K05172
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Condensed matter physics II
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| Research Institution | Hiroshima University |
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Principal Investigator |
Higashitani Seiji 広島大学, 先進理工系科学研究科(総), 教授 (70304368)
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| Project Period (FY) |
2015-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 奇周波数クーパー対 / アンドレーエフ束縛状態 / 超伝導 / 超流動 / 表面効果 / サイズ効果 / 時間反転対称性の破れ / 自発表面電流 / カイラル超伝導 / 表面束縛状態 / エッジ流 / 奇周波数クーパーペア / 表面電流 / 銅酸化物高温超伝導体 / アンドレーエフ表面束縛状態 / 表面散乱効果 / 時間反転対称性 / 超伝導薄膜 / 異方的超伝導 |
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| Outline of Final Research Achievements |
Superconducting states are generally classified into even-frequency and odd-frequency states. Cooper pairs in the latter state have a special property that they do not have equal-time correlation. The present study is a fundamental research on the physics of superconducting systems in which even-frequency and odd-frequency Cooper pairs coexist. In this study, we have obtained new insights into the effect of surface scattering and the shape effect of Fermi surfaces on a novel superconducting state with spontaneous current, which is stabilized in the coexisting state, such as realized in superconducting thin films.
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| Academic Significance and Societal Importance of the Research Achievements |
薄膜や細線などの制限空間で実現する超伝導状態では，表面の存在が系全体の物性を決める重要な要素となる．しかしながら，超伝導体の表面効果を議論した従来の理論の多くは，数学的な複雑さを避けるため，鏡面的な（ラフネスのない完全に平坦な）表面を仮定している．本研究では，表面のラフネスによる散漫的な電子散乱が超伝導に及ぼす影響を詳しく調べた．このような基礎研究は，今後の超伝導デバイス等の研究開発に資するものであり，応用上も重要である．
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Report
(7 results)
Research Products
(15 results)
